INDEX. 



371 



Pliny, his knowledge of quartz 

 and diamond, 239. 



Pneumatics, 228. 



Political economy, 73. 



Prejudices of opinion and 

 sense, 80. Conditions on 

 which such are injurious, 81. 

 Illustrated by the division of 

 the rays of light, by the 

 moon at the horizon, and by 

 ventriloquism, 82. By the 

 transition of the hand from 

 heat to cold, 83. 



Prevost, M., his theory of 

 heat, 316. His theory of 

 reciprocal interchanges, a 

 proof of the radiation of 

 cold, 318. 



Printing, the art of, 1 93. Per- 

 formed by steam, 1 94. 



Probabilities, doctrine of, 217. 

 Illustrated by shooting at a 

 wafer, 218. 



Prout, Dr., his opinion of the 

 atomic weights, 307. 



Pyrometry, 319. 



Pythagoras, philosophy of, 

 107. 



Quinine, sulphate of, com- 

 parative comfort and health 

 resulting from the use of, 56 



Radiation of heat, laws of, 205. 



Repulsion in fluids and solids, 

 227. 



Rules, general, for guiding 

 and facilitating our searcli 

 among a great mass of as- 

 sembled facts, 151. 



Rumford, count, experiments 

 of, on gunpowder, 62. 



Savart, M., his experiments 

 on solids, 243. His re- 

 searches on sound, 949. 



Science, abstract, a preparation 

 for the study of physics, 1 9. 

 Not indispensable to the 

 study of physical laws, 25. 

 Instances illustrative of, 27. 



Science, physical, nature and 

 objects, immediate and col- 

 lateral, as regarded in itself 

 and in its application to the 

 practical purposes of life, 

 and its influence on society, 

 35. State of, previous to 

 the age of Galileo and Ba^ 

 con, 104. Causes of the 

 rapid advance of, compared 

 with the progress at an 

 earlier period, 347. 



Science, natural, cause and ef- 

 fect, the ultimate relations 

 of, 76. 



Sciences and Arts, remarks on 

 the language, terms, or 

 signs used in treating of 

 them, 70. Receive an im- 

 pulse by the Baconian phi- 

 losophy, 114. 



Sensation, cause of, 91. 



Senses, inadequate to give us 

 direct information for the 

 exact comparison of quan- 

 tity, 124. Substitutes for 

 the inefficiency of, 125. 



Seringapatam, method of 

 breaking blocks from the 

 quarries of, 47. 



Shells found in rocks at a 

 great height above the sea, 

 supposed cause of, 145. 



Smeaton, his experiments on 

 bodies dilated by heat, 3 1 9. 



Solids, transparent, exhibit 

 periodical colours when ex- 

 posed to polarized light, 99. 

 Influence of, on the Mind, 

 101. 



Solids in general, nature of, 



